<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
       let socre =  prompt('请输入高考成绩')
       if(socre > 700){
        alert('恭喜你考上老年大学！！')
       } 
   </script>
</body>
</html>